Take a bicycle and go for two weeks. I've just been cycling around Ireland for a week, and would willingly have stayed for another week if schedule permitted. All you need is a couple of changes of t-shirt and undies, and some zip-off chinos - and a walkman with fm-radio (you can get a pocket fm-radio receiver in a pound-shop). Oh, and a helmet to protect you from some of the nutters behind the wheel
With the school holidays over next week, you should be able to turn-up at almost any B&B without booking